Retarding force on an object

A uniform, spherical planet of mass M and radius R moves SLOWLY with an essentially uniform speed v through a cloud of interstellar dust particles, whose density is ?. The dust particles are attracted towards the planet, and some of them would eventually fall onto its surface. Find the resulting retarding force on the planet due to the dust cloud.

TO GET YOUR ASSIGNMENTS DONE AT A CHEAPER PRICE,PLACE YOUR ORDER WITH US NOW